Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/ZoomSceneTracker.cpp @ 1914:ebe4fd1ad311
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Sun, 20 Mar 2022 18:01:57 +0100 |
| parents | 7053b8a0aaec |
| children | 9c0adcc8feec |
| rev | line source |
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| 596 | 1 /** |
| 2 * Stone of Orthanc | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
| 596 | 7 * |
| 8 * This program is free software: you can redistribute it and/or | |
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9 * modify it under the terms of the GNU Lesser General Public License |
| 596 | 10 * as published by the Free Software Foundation, either version 3 of |
| 11 * the License, or (at your option) any later version. | |
| 12 * | |
| 13 * This program is distributed in the hope that it will be useful, but | |
| 14 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Lesser General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Lesser General Public |
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19 * License along with this program. If not, see |
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20 * <http://www.gnu.org/licenses/>. |
| 596 | 21 **/ |
| 22 | |
| 23 | |
| 24 #include "ZoomSceneTracker.h" | |
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25 #include "../Scene2DViewport/ViewportController.h" |
| 596 | 26 |
| 27 namespace OrthancStone | |
| 28 { | |
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29 ZoomSceneTracker::ZoomSceneTracker(boost::weak_ptr<IViewport> viewport, |
| 596 | 30 const PointerEvent& event, |
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31 unsigned int canvasHeight) |
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32 : OneGesturePointerTracker(viewport) |
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33 , clickY_(event.GetMainPosition().GetY()) |
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34 , aligner_(viewport, event.GetMainPosition()) |
| 596 | 35 { |
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36 |
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37 std::unique_ptr<IViewport::ILock> lock(GetViewportLock()); |
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38 originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform(); |
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39 |
| 596 | 40 if (canvasHeight <= 3) |
| 41 { | |
| 42 active_ = false; | |
| 43 } | |
| 44 else | |
| 45 { | |
| 46 normalization_ = 1.0 / static_cast<double>(canvasHeight - 1); | |
| 47 active_ = true; | |
| 48 } | |
| 49 } | |
| 50 | |
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51 void ZoomSceneTracker::PointerMove(const PointerEvent& event) |
| 596 | 52 { |
| 53 static const double MIN_ZOOM = -4; | |
| 54 static const double MAX_ZOOM = 4; | |
| 55 | |
| 56 if (active_) | |
| 57 { | |
| 58 double y = event.GetMainPosition().GetY(); | |
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59 |
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60 // In the range [-1,1] |
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61 double dy = static_cast<double>(y - clickY_) * normalization_; |
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62 |
| 596 | 63 double z; |
| 64 | |
| 65 // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM] | |
| 66 if (dy < -1.0) | |
| 67 { | |
| 68 z = MIN_ZOOM; | |
| 69 } | |
| 70 else if (dy > 1.0) | |
| 71 { | |
| 72 z = MAX_ZOOM; | |
| 73 } | |
| 74 else | |
| 75 { | |
| 76 z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0; | |
| 77 } | |
| 78 | |
| 79 double zoom = pow(2.0, z); | |
| 80 | |
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81 std::unique_ptr<IViewport::ILock> lock(GetViewportLock()); |
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82 lock->GetController().SetSceneToCanvasTransform( |
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83 AffineTransform2D::Combine( |
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84 AffineTransform2D::CreateScaling(zoom, zoom), |
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85 originalSceneToCanvas_)); |
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86 aligner_.Apply(); |
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87 lock->Invalidate(); |
| 596 | 88 } |
| 89 } | |
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90 |
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91 void ZoomSceneTracker::Cancel() |
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92 { |
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93 std::unique_ptr<IViewport::ILock> lock(GetViewportLock()); |
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94 lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_); |
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95 lock->Invalidate(); |
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96 } |
| 596 | 97 } |